An update to iTunes is available, which is basically a security update to address an issue where a maliciously crafted website could lead to the application quitting or arbitrary code being executed. According to Apple's knowlegebase article on the security content of the update, the bug at hand occurs when a buffer overflow in the handling of iTunes URLs (itpc) is exploited.

iTunes 9.2 is available for download, ahead of the release of the new iPhone so features specific to that device will be functional when it arrives. Beyond this, the update addresses problems with album artwork displaying slowly, and includes a few new features such as syncing PDF documents as books, and organizing iOS4 apps into folders. Since iTunes 9.2 will be required for use with the new iPhone, if you are planning on upgrading your phone you might consider getting the software installed and ensure everything works on that end before upgrading your hardware.